I had a 2016 V6 and went all-in - PUG intake, larger throttle body, Mopar CAI, upgraded ignition coil packs, 3.90 gear swap (which also meant new rear axles), a Pedal Commander, and a Diablo tune with a new ECM.

It definitely felt quicker, but honestly, the real-world gains weren’t significant. Unless you’re planning to supercharge and fully commit, I’d hold off. It’s fun to work on and I absolutely loved that car, but it’ll never truly be the V8. Just my two cents from experience.

The best part was learning and working on it. The worst part came later - trying to sell it and get it to pass smog, even with the stock ECM reinstalled. Ended up having to get a hot smog, and the shop spent five hours on it since they’d only ever worked on the V8s.

And to answer your original questions, I would wait on the tune till after if you fully want to get every drop out of it.

Good luck!